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Pacific Banana Slug
Ariolimax columbianus
16,716 observations
Horned Nudibranch
Hermissenda crassicornis
7,530 observations
Black Slug
Arion ater
3,868 observations
Frilled Dogwinkle
Nucella lamellosa
3,534 observations
Pacific Sideband
Monadenia fidelis
3,321 observations
Brown-lipped Snail
Cepaea nemoralis
2,931 observations
Leopard Slug
Limax maximus
2,873 observations
Monterey Dorid
Doris montereyensis
2,781 observations
Lewis's Moon Snail
Neverita lewisii
2,776 observations
White-lined Dirona
Dirona albolineata
2,287 observations
Garden Snail
Cornu aspersum
2,250 observations
Mossy Chiton
Mopalia muscosa
1,915 observations
Lined Chiton
Tonicella lineata
1,695 observations
Nuttall's Cockle
Clinocardium nuttallii
1,639 observations
Northern Leopard Dorid
Diaulula odonoghuei
1,494 observations
Giant Nudibranch
Dendronotus iris
1,322 observations
Oregon forestsnail
Allogona townsendiana
1,293 observations
Branched Dendronotid
Dendronotus venustus
1,284 observations
barnacle-eating dorid
Onchidoris bilamellata
1,150 observations
Gumboot Chiton
Cryptochiton stelleri
1,150 observations
Three-lined Aeolid
Orienthella trilineata
1,148 observations
Woody Chiton
Mopalia lignosa
1,120 observations
White-and-orange-tipped Nudibranch
Antiopella fusca
1,025 observations
Hooded Nudibranch
Melibe leonina
964 observations
Nanaimo Dorid
Acanthodoris nanaimoensis
961 observations
Purple Mahogany Clam
Nuttallia obscurata
941 observations
Milky Slug
Deroceras reticulatum
926 observations
Red Sponge Dorid
Rostanga pulchra
923 observations
Striped Dogwinkle
Nucella ostrina
896 observations
Robust Lancetooth Snail
Haplotrema vancouverense
841 observations
Black Leather Chiton
Katharina tunicata
793 observations
Modest Clown Dorid
Triopha modesta
793 observations
Green Falsejingle
Pododesmus macrochisma
732 observations
Yellow-bordered Taildropper
Prophysaon foliolatum
712 observations
Noble Dorid
Peltodoris nobilis
679 observations
Rough Keyhole Limpet
Diodora aspera
670 observations
East Pacific Red Octopus
Octopus rubescens
617 observations
Opalescent Inshore Squid
Doryteuthis opalescens
580 observations
Rough Piddock
Zirfaea pilsbryi
551 observations
Northwest Hesperian
Vespericola columbianus
541 observations
Pacific Razor Clam
Siliqua patula
505 observations
Pacific Oyster
Magallana gigas
498 observations
Butter Clam
Saxidomus gigantea
491 observations
Festive Tritonid
Tritonia festiva
488 observations
Rocky Aeolid
Eubranchulus rupium
487 observations
Striped Nudibranch
Armina californica
479 observations
Reticulate Taildropper
Prophysaon andersonii
468 observations
California Mussel
Mytilus californianus
449 observations
Mask Limpet
Lottia persona
427 observations
Heath's Dorid
Geitodoris heathi
415 observations
Frequently Asked Questions
- The 10 most common molluscs in Washington are:
- Pacific Banana Slug (Ariolimax columbianus)
- Horned Nudibranch (Hermissenda crassicornis)
- Black Slug (Arion ater)
- Frilled Dogwinkle (Nucella lamellosa)
- Pacific Sideband (Monadenia fidelis)
- Brown-lipped Snail (Cepaea nemoralis)
- Leopard Slug (Limax maximus)
- Monterey Dorid (Doris montereyensis)
- Lewis's Moon Snail (Neverita lewisii)
- White-lined Dirona (Dirona albolineata)
- The most observed mollusc in Washington is Pacific Banana Slug (Ariolimax columbianus), with 16,716 recorded observations.